\\[-1.8ex] Soil Heterogeneity & 0.454 & $-$0.388 & $-$0.091 & $-$0.091 & $-$0.078 & $-$0.008 & $-$0.012 \\ 
  & (0.488) & (0.274) & (0.259) & (0.260) & (0.259) & (0.264) & (0.264) \\ 
\\[-1.8ex] 
Observations & 570,121 & 570,121 & 570,121 & 570,121 & 570,121 & 566,731 & 566,731 \\ 
R$^{2}$ & 0.00002 & 0.050 & 0.051 & 0.051 & 0.051 & 0.051 & 0.052 \\ 
